Furnace.



W. GARTNER;`

' FURNAUE.

APPLICATION FILED JULY 1s, 191s Patented Mar. 10, 1,914

`2 SEEETS-SHEET l.

W. GARTNER.

FURNAGB; APPLIGATION PILBD JULY 19, 191.3.

` Patented Mar. 10, 1914 2 SHEBTSMSHEET 2.

'WALTER GARTNER, 0F HAMBURG, GERMANY.

FURNACE.

Specification of Letters Patent. Patent-ed play. 10, 1914 Application led July 19, 1913. Serial No. 779,966.

To all 'whom t may concern/.f

Be it known that I, WALTER GARTNER, subject of the Emperor of Germany, res1ding at 'Ferdinandstrasse 25, Hamburg, in

Germany, have invented a certain new and useful Furnace, of which the following is a specification. y

This invention relates to a furnace, esperially suitable for steam generators, of the type in which the fuel is fed laterally to the fire grate through inclined passages in which the fuel is partially colred before reaching the grate, fireproof partitions, with or without air passages, restricting the size of the fuel passages.

The object of this inyention, which is more particularly applicable to WalleA -tube steam generators, is kto provide a furnace in which the combustion of the fuel on the grate can be more readily controlled than in those of the type above described hitherto made.

According to this invention supplementary side gratas are formed along either side of the main grate so as to occupy a position between the latter and the fuel passages. Air, which is warmed in the roof of the furnace chamber, is supplied to the side grates through conduits provided with dampers enabling the amount of air delivered through the side grates to be varied independently of the amount of airywhich passes throu h'the main grate from the ashpit. Furt er, the temperature of the air below the side grates can be varied independently of that supplied to the main grate and in this way a smokeless tire is in sured and combustion can be accelerated or retarded by varying the supply of air to the side grates or main grate.V As in previous constructions passages for cooling air are preferably formed in thcflreproof pai titions which limit the upper sides of the fuel passages, the air being'draind'irect from the atmosphere. After cooling the rear Wall of the fireproof partition, to prevent the coal in contact therewith being prematurely coked, the cooling air flows through suitable apertures or conduits to the combustion chamber where. it assists combustion after being heated by flowing through the fireproof partition. ln this way not only is warm air supplied to the combustion chamber to support combustion but further a continuous circulation of cold air through the cooling conduits is insured.

In the accompanying drawings which show a furnace for a 'water-tube ASteam'generator in accordance with this invention, Figure l is a sectional side elevation through the grate and furnace chamber on the line 1-1 of Fig. Fig. 2 is a crosssection through the furnace chamber and the furnace, and Fig. 3 shows the furnace partly in end elevation and partly in section through the conduits which supply air to the main and supplementary side grates.

In the construction illuslrated the furnace comprises a combustion chamber A provided with a curved grate B to which fuel is supplied through inclined lateral passages C, and hoppers C of any suitable type communicating with these pasasagcs. As in previous constructions, lireprcof partitions D are provided which forni the walls of the combustion chamber, and the undersides of these partitions limit the inclined passages through which the 'fuel is fed to the grate. According to this invention on either side of the main grate, and separate therefrom in so far as the air supply is concerned, are supplementary sido grates lll, these gratos occupying a positionintermediate between the lateral edges of the main grate and the fuel passagcz-` The roof of the furnafc chamber is formed hollow and communicates with the atmosphere, air chamlicrs F locing'thus provided above the combustion chamber. The air to support combustion enters the chambers F at the rear, open end thereof (Fig.

l.) and passes downward through vertical' conduits F to the horizontal conduits E arranged below each of the supplementary side gratas E. ln this way warm air is supplied to the si'lpplementary gratos and a damper F1 in the conduit F enables the amount of air supplied to be varied. Further, additional cold air from the atmosphere vcan be .introduced into the conduits E by meats of suitable dampcrs or doors FF formed on the front *all of the jlurnacc.

As already stated, thc air supplied to the main grato l. is independent of that which flows through the conduits F/ to the supplementary gratos E. Cold air is 'introduced to the main grate through a door or damper B which. closes the ashpit and :n.ditional warm air can be supplied to the .n grate through branch passages G co 'oiled by' dempers G, these passages coumnuiicatout with the 'I'iassages F which supply the not 

